[kkarakk]

Filtering out bad data is a part of the job when analyzing the data for information...There are tons of ways people try to mess with these to the point where in a way it's trivial to filter it out-since basically you're trying to extract value in a way that is not real.

For a contrived eg, serving an ad for a niche product instead of the targeted ad and the ad still getting tons of clicks signals pretty highly that the data coming in is being gamed in some way.

It's called click fraud and it's pretty heavily researched